There are
1,584 mi
from Arlington Heights, IL to Kalispell, MT
That's the driving distance. It would take 1 day 4 hours to go from Arlington Heights, Illinois to Kalispell, Montana.
The flight distance (direct flight from Arlington Heights, IL to Kalispell, MT) is 1,343.27 mi.
1,584 mi = 2,548.57 kms